This fin can is designed to fit BT-60 body tubing, which is roughly 1/45.45 scale. This is a sport-scale rocket, but I have included the Solidworks file if you would like to use it as a base for a more detailed model. At this scale, the body tube should be 15.137" long.
redstone_fin_can_bt60.SLDPRT | 164.6KB | |
redstone_fin_can_bt60.STL | 26.2KB |